This is a ST Racing Concepts Aluminum Turnbuckle Wrench with 4 mm and 5 mm ends, This light weight wrench has been CNC machined to have exact fit over 4mm turnbuckles (like ones found on Traxxas Slash Rustler Bandit and Stampede or all popular on-road touring cars today) and the 5 mm turnbuckle adjustment nut on the T-Maxx E-Maxx and Revo or any vehicle that uses a 5 mm size turnbuckle, This is a great tool to use when tuning your favorite R/C racing machine, Color: Blue, SKU: RCST5475B